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The Tiferet Hashabat deals with the question why the Paytan (poet?) changed the order of being late leaving the Shabat and being early in getting into it. He explains that it was done for the rhyme: Ohavo, Eruvo, Bo. Maybe we can use this explanation that Zea Avraham Ohavo was used for that reason (the rhyme) , keeping in mind that Bnei Yisrael answer to that definition.

That doesn't really answer the question. I mean, it could as well have said zera Yisrael ohavo as zera Avraham ohavo.
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msh210♦Nov 11 '11 at 16:26

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The phrase zera ... ohavo appears in Chazal only as zera Avraham ohavo. But you are right that the paytan could have said zera Ya'akov bechiro too. But that wouldn't include the Geirim which we see as Bnei Abraham
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ronyNov 12 '11 at 20:05